While I was sitting with the Prophet, Abu Bakr came, lifting up one corner of his garment uncovering his knee. The Prophet ﷺ said, "Your companion has had a quarrel." Abu Bakr greeted (the Prophet ﷺ ) and said, "O Messenger of Allah ﷺ! There was something (i.e. quarrel) between me and the Son of Al-Khattab. I talked to him harshly and then regretted that, and requested him to forgive me, but he refused. This is why I have come to you." The Prophet ﷺ said thrice, "O Abu Bakr! May Allah forgive you." In the meanwhile, ʿUmar regretted (his refusal of Abu Bakr's excuse) and went to Abu Bakr's house and asked if Abu Bakr was there. They replied in the negative. So he came to the Prophet ﷺ and greeted him, but signs of displeasure appeared on the face of the Prophet ﷺ till Abu Bakr pitied (ʿUmar), so he knelt and said twice, "O Messenger of Allah ﷺ! By Allah! I was more unjust to him (than he to me)." The Prophet ﷺ said, "Allah sent me (as a Prophet) to you (people) but you said (to me), 'You are telling a lie,' while Abu Bakr said, 'He has said the truth,' and consoled me with himself and his money." He then said twice, "Won't you then give up harming my companion?" After that nobody harmed Abu Bakr. (Using translation from Bukhārī 3661)
كُنْتُ جَالِسًا عِنْدَ النَّبِيِّ ﷺ إِذْ أَقْبَلِ أَبُو بَكْرٍ ؓ آخِذًا بِطَرَفِ ثَوْبِهِ حَتَّى أَبْدَى عَنْ رُكْبَتَيْهِ فَقَالَ أَمَّا صَاحِبُكُمْ هَذَا فَقَدْ غَامَرَ فَسَلَّمَ وَقَالَ إِنَّهُ كَانَ بَيْنِي وَبَيْنَ عُمَرَ بْنِ الْخَطَّابِ شَيْءٌ فَأَسْرَعْتُ إِلَيْهِ ثُمَّ ذَهَبَ فَسَأَلْتُهُ أَنْ يَغْفِرَ لِي فَأَبَى عَلَيَّ وَتَحَرَّزَ مِنِّي بِدَارِهِ فَأَقْبَلْتُ إِلَيْكَ فَقَالَ يَغْفِرُ اللهُ لَكَ يَا أَبَا بَكْرٍ ثَلَاثًا ثُمَّ إِنَّ عُمَرَ ؓ نَدِمَ فَأَتَى مَنْزِلَ أَبِي بَكْرٍ ؓ فَسَأَلَ أَثَمَّ أَبُو بَكْرٍ؟ فَقَالُوا لَا فَأَقْبَلَ إِلَى النَّبِيِّ ﷺ فَجَعَلَ وَجْهُ النَّبِيِّ ﷺ يَتَمَعَّرُ حَتَّى أَشْفَقَ أَبُو بَكْرٍ فَجَثَا عَلَى رُكْبَتَيْهِ فَقَالَ يَا رَسُولَ اللهِ أَنَا وَاللهِ كُنْتُ أَظْلَمَ مَرَّتَيْنِ فَقَالَ رَسُولُ اللهِ ﷺ يَا أَيُّهَا النَّاسُ إِنَّ اللهَ سُبْحَانَهُ وَتَعَالَى بَعَثَنِي إِلَيْكُمْ فَقُلْتُمْ كَذَبْتَ وَقَالَ أَبُو بَكْرٍ صَدَقْتَ وَوَاسَانِي بِنَفْسِهِ وَمَالِهِ فَهَلْ أَنْتُمْ تَارِكُونَ لِي صَاحِبِي؟ قَالَهَا مَرَّتَيْنِ فَمَا أُوذِيَ بَعْدَهَا